he's the charismatic former congressman from chicago who voters had just re-elected to a tenth term despite being absent most of the year and facing legal and health troubles. jesse jackson jr., son of civil rights leader reverend jesse jackson, announced his resignation this week citing, quote, several serious health issues, but jackson is also the subject of fbi and house ethics investigations. so let's bring in cnn legal contributor paul callan to talk a little bit more about this. paul, good morning. >> good morning, randi. >> the fbi is investigating jackson for allegedly misusing campaign funds for personal use, but he hasn't been charged with any crimes. what's he facing, and when are the consequences here? >> well, you know, there are two aspects to this investigation, and we don't know a lot about it, because there haven't been public announcements made by the justice department or the fbi, but one is personal use of campaign funds. there's a claim that he -- his funds were used to transport a mistress apparently back and forth from washington, d.c. to chicago at some point in time